The same riff goes through the whole song. Listen for when the bass comes on.

 G----------------------------------------------------------------------------|
 D----------------------------------------------------------------------------|
 A------------------5-7777777-5--7777777--------------------------------------|
 E--2222222-5555555-----------------------------------------------------------|

The reason I posted this tab is because all the tabs I found for this amazing song were
wrong. (Every other tab plays E to F# in the second part, but that just sounds way off)